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Island-type growth of Au–Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms

Opened Access Island-type growth of Au–Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms

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Autor: García Negrete, Carlos Andrés
Knappett, Benjamin R
Schmidt, F.P
Rojas Ruíz, Teresa Cristina
Wheatley, Andrew E.H
Hofer, F
Fernández Camacho, Alejandro
Fecha: 2015
Publicado en: RSC Advances, 5, 1-7.
Tipo de documento: Artículo
Resumen: Structural and analytical characterization related to the formation mechanism of Au–Pt heterodimers from polyhedral Pt nanocrystals is reported. The observation of specific lattice strain effects and the emergence of misfit dislocations point to the relevance of the Stranski–Krastanov growth mode as a means of explaining the previously reported dimerisation reaction between Au and Pt. Two size-dependent strain relief mechanisms were identified. For dimers grown from 4.7 nm seeds, the mechanism is related to bulk lattice strain accumulation at {111} planes along with lattice relaxation effects on other crystalline planes. However, for dimers grown from 11.2 nm seed sizes, the formation of misfit dislocations proved to be a highly efficient mechanism by which to release interface mismatch strain. Nanoscale chemical mapping at Au–Pt interfaces also revealed Au–Pt alloying to be unlikely under the mild temperature conditions employed in this work for Au–Pt heterodimer synthesis
Cita: García Negrete, C.A., Knappett, B.R., Schmidt, F.P., Rojas Ruíz, T.C., Wheatley, A.E.H., Hofer, F. y Fernández Camacho, A. (2015). Island-type growth of Au–Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms. RSC Advances, 5, 1-7.
Tamaño: 1.070Mb
Formato: PDF

URI: https://hdl.handle.net/11441/71661

DOI: 10.1039/c5ra09808d

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